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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2009 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.primitives.Primitives;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Map;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import javax.annotation.Nullable;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * A class-to-instance map backed by an {@link ImmutableMap}. See also {@link<a name="line.28"></a>
<span class="sourceLineNo">029</span> * MutableClassToInstanceMap}.<a name="line.29"></a>
<span class="sourceLineNo">030</span> *<a name="line.30"></a>
<span class="sourceLineNo">031</span> * @author Kevin Bourrillion<a name="line.31"></a>
<span class="sourceLineNo">032</span> * @since 2.0 (imported from Google Collections Library)<a name="line.32"></a>
<span class="sourceLineNo">033</span> */<a name="line.33"></a>
<span class="sourceLineNo">034</span>public final class ImmutableClassToInstanceMap&lt;B&gt; extends<a name="line.34"></a>
<span class="sourceLineNo">035</span>    ForwardingMap&lt;Class&lt;? extends B&gt;, B&gt; implements ClassToInstanceMap&lt;B&gt; {<a name="line.35"></a>
<span class="sourceLineNo">036</span>  /**<a name="line.36"></a>
<span class="sourceLineNo">037</span>   * Returns a new builder. The generated builder is equivalent to the builder<a name="line.37"></a>
<span class="sourceLineNo">038</span>   * created by the {@link Builder} constructor.<a name="line.38"></a>
<span class="sourceLineNo">039</span>   */<a name="line.39"></a>
<span class="sourceLineNo">040</span>  public static &lt;B&gt; Builder&lt;B&gt; builder() {<a name="line.40"></a>
<span class="sourceLineNo">041</span>    return new Builder&lt;B&gt;();<a name="line.41"></a>
<span class="sourceLineNo">042</span>  }<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>  /**<a name="line.44"></a>
<span class="sourceLineNo">045</span>   * A builder for creating immutable class-to-instance maps. Example:<a name="line.45"></a>
<span class="sourceLineNo">046</span>   * &lt;pre&gt;   {@code<a name="line.46"></a>
<span class="sourceLineNo">047</span>   *<a name="line.47"></a>
<span class="sourceLineNo">048</span>   *   static final ImmutableClassToInstanceMap&lt;Handler&gt; HANDLERS =<a name="line.48"></a>
<span class="sourceLineNo">049</span>   *       new ImmutableClassToInstanceMap.Builder&lt;Handler&gt;()<a name="line.49"></a>
<span class="sourceLineNo">050</span>   *           .put(FooHandler.class, new FooHandler())<a name="line.50"></a>
<span class="sourceLineNo">051</span>   *           .put(BarHandler.class, new SubBarHandler())<a name="line.51"></a>
<span class="sourceLineNo">052</span>   *           .put(Handler.class, new QuuxHandler())<a name="line.52"></a>
<span class="sourceLineNo">053</span>   *           .build();}&lt;/pre&gt;<a name="line.53"></a>
<span class="sourceLineNo">054</span>   *<a name="line.54"></a>
<span class="sourceLineNo">055</span>   * After invoking {@link #build()} it is still possible to add more entries<a name="line.55"></a>
<span class="sourceLineNo">056</span>   * and build again. Thus each map generated by this builder will be a superset<a name="line.56"></a>
<span class="sourceLineNo">057</span>   * of any map generated before it.<a name="line.57"></a>
<span class="sourceLineNo">058</span>   *<a name="line.58"></a>
<span class="sourceLineNo">059</span>   * @since 2.0 (imported from Google Collections Library)<a name="line.59"></a>
<span class="sourceLineNo">060</span>   */<a name="line.60"></a>
<span class="sourceLineNo">061</span>  public static final class Builder&lt;B&gt; {<a name="line.61"></a>
<span class="sourceLineNo">062</span>    private final ImmutableMap.Builder&lt;Class&lt;? extends B&gt;, B&gt; mapBuilder<a name="line.62"></a>
<span class="sourceLineNo">063</span>        = ImmutableMap.builder();<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    /**<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * Associates {@code key} with {@code value} in the built map. Duplicate<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * keys are not allowed, and will cause {@link #build} to fail.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     */<a name="line.68"></a>
<span class="sourceLineNo">069</span>    public &lt;T extends B&gt; Builder&lt;B&gt; put(Class&lt;T&gt; key, T value) {<a name="line.69"></a>
<span class="sourceLineNo">070</span>      mapBuilder.put(key, value);<a name="line.70"></a>
<span class="sourceLineNo">071</span>      return this;<a name="line.71"></a>
<span class="sourceLineNo">072</span>    }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>    /**<a name="line.74"></a>
<span class="sourceLineNo">075</span>     * Associates all of {@code map's} keys and values in the built map.<a name="line.75"></a>
<span class="sourceLineNo">076</span>     * Duplicate keys are not allowed, and will cause {@link #build} to fail.<a name="line.76"></a>
<span class="sourceLineNo">077</span>     *<a name="line.77"></a>
<span class="sourceLineNo">078</span>     * @throws NullPointerException if any key or value in {@code map} is null<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * @throws ClassCastException if any value is not an instance of the type<a name="line.79"></a>
<span class="sourceLineNo">080</span>     *     specified by its key<a name="line.80"></a>
<span class="sourceLineNo">081</span>     */<a name="line.81"></a>
<span class="sourceLineNo">082</span>    public &lt;T extends B&gt; Builder&lt;B&gt; putAll(<a name="line.82"></a>
<span class="sourceLineNo">083</span>        Map&lt;? extends Class&lt;? extends T&gt;, ? extends T&gt; map) {<a name="line.83"></a>
<span class="sourceLineNo">084</span>      for (Entry&lt;? extends Class&lt;? extends T&gt;, ? extends T&gt; entry<a name="line.84"></a>
<span class="sourceLineNo">085</span>          : map.entrySet()) {<a name="line.85"></a>
<span class="sourceLineNo">086</span>        Class&lt;? extends T&gt; type = entry.getKey();<a name="line.86"></a>
<span class="sourceLineNo">087</span>        T value = entry.getValue();<a name="line.87"></a>
<span class="sourceLineNo">088</span>        mapBuilder.put(type, cast(type, value));<a name="line.88"></a>
<span class="sourceLineNo">089</span>      }<a name="line.89"></a>
<span class="sourceLineNo">090</span>      return this;<a name="line.90"></a>
<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    private static &lt;B, T extends B&gt; T cast(Class&lt;T&gt; type, B value) {<a name="line.93"></a>
<span class="sourceLineNo">094</span>      return Primitives.wrap(type).cast(value);<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    /**<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * Returns a new immutable class-to-instance map containing the entries<a name="line.98"></a>
<span class="sourceLineNo">099</span>     * provided to this builder.<a name="line.99"></a>
<span class="sourceLineNo">100</span>     *<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * @throws IllegalArgumentException if duplicate keys were added<a name="line.101"></a>
<span class="sourceLineNo">102</span>     */<a name="line.102"></a>
<span class="sourceLineNo">103</span>    public ImmutableClassToInstanceMap&lt;B&gt; build() {<a name="line.103"></a>
<span class="sourceLineNo">104</span>      return new ImmutableClassToInstanceMap&lt;B&gt;(mapBuilder.build());<a name="line.104"></a>
<span class="sourceLineNo">105</span>    }<a name="line.105"></a>
<span class="sourceLineNo">106</span>  }<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span>  /**<a name="line.108"></a>
<span class="sourceLineNo">109</span>   * Returns an immutable map containing the same entries as {@code map}. If<a name="line.109"></a>
<span class="sourceLineNo">110</span>   * {@code map} somehow contains entries with duplicate keys (for example, if<a name="line.110"></a>
<span class="sourceLineNo">111</span>   * it is a {@code SortedMap} whose comparator is not &lt;i&gt;consistent with<a name="line.111"></a>
<span class="sourceLineNo">112</span>   * equals&lt;/i&gt;), the results of this method are undefined.<a name="line.112"></a>
<span class="sourceLineNo">113</span>   *<a name="line.113"></a>
<span class="sourceLineNo">114</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; Despite what the method name suggests, if {@code map} is<a name="line.114"></a>
<span class="sourceLineNo">115</span>   * an {@code ImmutableClassToInstanceMap}, no copy will actually be performed.<a name="line.115"></a>
<span class="sourceLineNo">116</span>   *<a name="line.116"></a>
<span class="sourceLineNo">117</span>   * @throws NullPointerException if any key or value in {@code map} is null<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * @throws ClassCastException if any value is not an instance of the type<a name="line.118"></a>
<span class="sourceLineNo">119</span>   *     specified by its key<a name="line.119"></a>
<span class="sourceLineNo">120</span>   */<a name="line.120"></a>
<span class="sourceLineNo">121</span>  public static &lt;B, S extends B&gt; ImmutableClassToInstanceMap&lt;B&gt; copyOf(<a name="line.121"></a>
<span class="sourceLineNo">122</span>      Map&lt;? extends Class&lt;? extends S&gt;, ? extends S&gt; map) {<a name="line.122"></a>
<span class="sourceLineNo">123</span>    if (map instanceof ImmutableClassToInstanceMap) {<a name="line.123"></a>
<span class="sourceLineNo">124</span>      @SuppressWarnings("unchecked") // covariant casts safe (unmodifiable)<a name="line.124"></a>
<span class="sourceLineNo">125</span>      // Eclipse won't compile if we cast to the parameterized type.<a name="line.125"></a>
<span class="sourceLineNo">126</span>      ImmutableClassToInstanceMap&lt;B&gt; cast = (ImmutableClassToInstanceMap) map;<a name="line.126"></a>
<span class="sourceLineNo">127</span>      return cast;<a name="line.127"></a>
<span class="sourceLineNo">128</span>    }<a name="line.128"></a>
<span class="sourceLineNo">129</span>    return new Builder&lt;B&gt;().putAll(map).build();<a name="line.129"></a>
<span class="sourceLineNo">130</span>  }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span>  private final ImmutableMap&lt;Class&lt;? extends B&gt;, B&gt; delegate;<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>  private ImmutableClassToInstanceMap(<a name="line.134"></a>
<span class="sourceLineNo">135</span>      ImmutableMap&lt;Class&lt;? extends B&gt;, B&gt; delegate) {<a name="line.135"></a>
<span class="sourceLineNo">136</span>    this.delegate = delegate;<a name="line.136"></a>
<span class="sourceLineNo">137</span>  }<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span>  @Override protected Map&lt;Class&lt;? extends B&gt;, B&gt; delegate() {<a name="line.139"></a>
<span class="sourceLineNo">140</span>    return delegate;<a name="line.140"></a>
<span class="sourceLineNo">141</span>  }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>  @Override<a name="line.143"></a>
<span class="sourceLineNo">144</span>  @SuppressWarnings("unchecked") // value could not get in if not a T<a name="line.144"></a>
<span class="sourceLineNo">145</span>  @Nullable<a name="line.145"></a>
<span class="sourceLineNo">146</span>  public &lt;T extends B&gt; T getInstance(Class&lt;T&gt; type) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>    return (T) delegate.get(checkNotNull(type));<a name="line.147"></a>
<span class="sourceLineNo">148</span>  }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>  /**<a name="line.150"></a>
<span class="sourceLineNo">151</span>   * Guaranteed to throw an exception and leave the map unmodified.<a name="line.151"></a>
<span class="sourceLineNo">152</span>   *<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * @throws UnsupportedOperationException always<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * @deprecated Unsupported operation.<a name="line.154"></a>
<span class="sourceLineNo">155</span>   */<a name="line.155"></a>
<span class="sourceLineNo">156</span>  @Deprecated<a name="line.156"></a>
<span class="sourceLineNo">157</span>  @Override<a name="line.157"></a>
<span class="sourceLineNo">158</span>  public &lt;T extends B&gt; T putInstance(Class&lt;T&gt; type, T value) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>    throw new UnsupportedOperationException();<a name="line.159"></a>
<span class="sourceLineNo">160</span>  }<a name="line.160"></a>
<span class="sourceLineNo">161</span>}<a name="line.161"></a>




























































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